Twitter lists are a handy way of paying attention to a group of people with a common interest. But the trouble with using lists to focus attention is that people often tweet on more than one subject. When following a list of people interested in “government 2.0″, the list stream will include a lot of posts on other topics. But if you filter the stream on a hashtag, you now have a stream, with posts by interesting people, only about the topic you care about.
Topically filtered li...